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The Wikipedia page has a modern photograph captioned 'Puffing Billy as seen from the front', with the driver's end. It doesn't mention the source for assuming this though. But I can imagine putting the driver at the front so he can have a good view in at least one direction.
Apparently the boiler is of a 'returning flue' type, so the flue tubes, having passed through the boiler once, go through a U-bend (under the domed cover at the 'drivers' end) and then go back through the boiler again to the chimney end. Hence the firebox and chimney being at the same end.
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